ambassador susan rice as a replacement for secretary of state hillary clinton. >> we will do whatever is necessary to block the nomination. >> reporter: senators john mccain and lindsey graham say rice was either lying or incompetent when she made this statement five days after the attack. >> we do not have information at present that leads us to conclude that this was premeditated or preplanned. >> reporter: president obama said the ambassador was presenting the intelligence information she was given, to challenge those who attacked ambassador rice. >> if senator mccain and graham and others want to go after somebody, they should go after me. >> reporter: senator mccain accepted that offer. >> the president of the united states the commander-in-chief is the most responsible and i hope the president has no illusions about our view of his responsibility. >> reporter: mccain and graham want a watergate-style committee to investigate the benghazi attack. susan mcginnis, cbs news, washington. >>> the military has suspended the security clearance for the woman at the center of the petreaus